Charfi, A. A., & Atif, M. (2014). Virtual Agent: A Determinant of Online Social Presence and Consumer Trust in Websites. International Journal of Economic Practices and Theories, 4(5), 796-806. Retrieved from http://ijept.eu/index.php/ijept/article/view/Virtual_Agent_A_Determinant_of_Online_Social_Presence_and_Cons